why we set CAMDIVN and CLKDIVN

[Andy Green]

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Somebody in the thread at some point said:
| i find :
| set CLKDIVN is to make    FCLK:HCLK:PCLK = 1:3:6
|
| HDIVN [2:1]    00 : HCLK = FCLK/1.
|                    01 : HCLK = FCLK/2.
|                    10 : HCLK = FCLK/4 when CAMDIVN[9] = 0.
|                            HCLK= FCLK/8 when CAMDIVN[9] = 1.
|                    11 : HCLK = FCLK/3 when CAMDIVN[8] = 0.
|                            HCLK = FCLK/6 when CAMDIVN[8] = 1.
| PDIVN  [0]    0: PCLK has the clock same as the HCLK/1.  0
|                    1: PCLK has the clock same as the HCLK/2.
|
| ----i still don't know why we set CAMDIVN

In CLKDIVN "HDIVN" field, you need to set CAMDIVN[9..8] to select HDIVN
rate meaning... we used HDIVN=11, so CAMDIVN[9..8] chooses if that means
HCLK = FCLK/3 or FCLK/6.  If we didn't set CAMDIVN too, HCLK rate would
be unknown if it was FCLK / 3 or FCLK / 6.

| ----i still can't run the C function by add "stack_setup".

Can't help from this description.

- -Andy
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